<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <h1>修改商品页面</h1>
    <input type="text" v-model="product.id">
    <input type="text" v-model="product.title">
    <input type="text" v-model="product.price">
    <input type="text" v-model="product.num">
    <input type="button" value="修改商品" @click="update()">
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
   let v = new Vue({
        el: "body>div",
        data:{
            product:{
                id:"",
                title:"",
                price:"",
                num:""
            }
        },
       methods:{
            update(){
                //发出异步修改请求
                axios.post("/update",v.product).then(function (response){
                    alert("修改完成!");
                    location.href="/list.html";//返回列表页面

                })
            }

       },
       created:function (){
           //发请求获取修改商品的信息
           //location.search得到?以及参数  ?id=3
           axios.get("/selectById"+location.search).then(function (response){
               //服务器响应的是一个商品对象的信息
               v.product = response.data;
           })
       }
    })
</script>

</body>
</html>